Bug 144060 (dothan_cpufreq) - [PATCH] speedstep-centrino support for dothan pentium-m
Summary: [PATCH] speedstep-centrino support for dothan pentium-m
Alias: dothan_cpufreq
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
(Show other bugs)
Version: 3
Hardware: i686 Linux
Target Milestone: ---
Assignee: Dave Jones
QA Contact: Brian Brock
Depends On:
TreeView+ depends on / blocked
Reported: 2005-01-04 08:29 UTC by david paeme
Modified: 2015-01-04 22:14 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2005-06-01 06:06:22 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
speedstep-centrino dothan frequency table patch (3.62 KB, patch)
2005-01-04 08:31 UTC, david paeme
no flags Details | Diff

Description david paeme 2005-01-04 08:29:35 UTC
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5)
Gecko/20041111 Firefox/1.0

Description of problem:
The kernels distributed with FC3 (up to the version in
updates/testing) seem to be missing support for intel's Dothan Pentium-M.

The processors are recognized, but the speedstep-centrino module only
has support for acpi frequency scaling on them. 
This compared to the older Banias model's 'table' support, which means
that cpufreq knows more than max/min speeds, and is able to scale
fluently between them

Here's a patch wich adds support for all Dothan cpu's up to the 755
version (2.0 Ghz).


Applying this patch to the latest FC3 kernels seem to work for me
(dothan 1.6ghz, stepping b0), and it also patches into the official
2.9.10 kernels.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
boot and check frequencies on dothan pentium-m's

Additional info:

Comment 1 david paeme 2005-01-04 08:31:00 UTC
Created attachment 109317 [details]
speedstep-centrino dothan frequency table patch

Comment 2 Alistair Riddoch 2005-05-28 10:30:00 UTC
Is anything likely to happen with this patch? I note that it was posted to the
LKML, but no there was no response there.

It would be really helpfull if speedstepping for the Pentium-M was available
without a kernel rebuild.

Comment 3 Dave Jones 2005-06-01 06:06:22 UTC
We can't do table support on Dothans -- there are four different voltage
settings -- and using VID#C (like the patch does) is not necessarily the one
needed for one platform. And VID#C is higher than VID#D so it even might
cause hardware damage.

Note You need to log in before you can comment on or make changes to this bug.